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f(1) = 5 ------> a.1+b=5 -----> a+b = 5
f(-1) = 1 -----> a.(-1)+b=1 -----> -a+b=1 _
2a = 4 ---------> a=2
a+b = 5 -----> 2+b = 5
b = 5-2
b = 3
jd fungsi itu adl f(x) = ax+b -----> f(x) = 2x+3